Plotting instrument



SEARCH ROOM @Rus-5 REFERENCE.

F. N. SAYRE Dec. 2G, 1932.

mam. mm n ATTOF\"'EYS.

Dec' 20, 1932- F. N. sAYRE 1,891,502v

' PLOTTING INSTRUMENT y Filed Jan. 21. 1927 5 Sheets-Sheet 2 M XINI/EN'I'OR.

Dec. 20, 1932. F. N. s-AYRE PLOTTING INSTRUMENT Filed Jan, 2l. 1927 F. m W5 Mm WN m F ATTORNEY Dec. 20', 1932. F. N. SAYRE SLOTTING INSTRUMENT n 5w m bwwnu ad m m y C .nI M10 5 d f m no f E P 5 n m 2 w P a. W H

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NVENTR FN/x/ /Y, jf BY MCL fn-m ATTORNEY Dec. 2o, 1932. F, N, SYRE 1,891,502

PLOTTING INSTRUMENT A med aan. 21, 1927 5 sheets-sheet 5 FIG /8.

F/G. ZZ.

XNVENTOR FRAN/f N SAYQE ATTORNEY Patented Dec. 20, 1932 PATEN lFRANK'N'. SAYRE, OF SAN FRANCISCO, CALIFORNIA .PLOTTIN G INSTRUMENT Application met January a1, 1927. sei-a1 No. 162,532.

(GRANTED UNDER THE ACT 0F MARCH 3, 1883, AS AMENDED APRIL 3D, 1928; 370 Q. G. 757) My invention relates broadly to recording instruments and more particularly to devices for recording the movement of a body in a single plane.

The principal object of my invention is to provide means for graphically recording the motion of a body, hereinafter designated as a carrier, on a plane surface such as recording the motion of a ship over thesurface of the ocean or the motion of airplane over the earths surface.

Another objectof my invention is to provide means for continuously and automatically indicating the distance and bearing of an obj ect, such as a stationary or moving,T ship from the carrier upon which my device is mounted.

A further object of my invention is to provide a means for correcting the errors in recording the track of the carrier that are introduced into such a track by the movements of the medium through or upon which the carrier is moving.

A further object of my invention is the application of means Within my recorder to compensate for errors Aintroduced into the graphic record bv the variable traction of the motive power of the carrier in the medium traversed.

A further object of my invention is the utilization of means for correcting the track of the motion of the carrier for the errors introducedtherein by l-:novvn deviations in the direction indicating instruments.

To attain these and other objects, and in accordance 'with the general features of this unitary and related invention, the improved method contemplates, in the operation of recording the course of the relative motion of a body and a plane surface, the steps, substantialiy simultaneously with said motion of making tivo ino 'ements, each of Whose magnitudes is proportional tothe relative velocity of said motion; than, transforming said first movements into two linear right angled movements, the rate of one of which be proportional to the sine, and the other to thi;-r cosine, of the angle between the direction of said relative motion and a reference direction; and substantially simultaneously transforming said two right angled movements into a resultant single movement upon a record; and further contemplates the varying of the rate of movement to be imparted from said sine movement t-o compensate for currents and other traverse conditions; and further contemplates the varying of the rate of movementto be imparted from said cosine movement to compensate for drift and other variable directional conditions; and further' contemplates that said first named movements may be successively or progressively made. l

To demonstrate the practical utility of my said method a related, improved and novel apparatus embodying niv inve and Which may be used advantageously and eco l nomically in practicing said improved method as a unitar 1 invention, is provided to also serve as an example, to those skilled in the art, of the facility with which, after becoming familiar with my invent-ion, the many forms and kinds of existing apparatus, With or without substantial modification, may be employed in the eihcie-nt practice of my said' method.

These and other objects of my invention will be more apparent from the following detailed description and the accompanying dra-Wings, illustrating one embodiment of my' invention in an improved apparatus, of the many different forms and characters of apparatus. each of which may be adapted to be employed in the practice of my improved method.

Further objects of vmy invention Will appear more fully hereinafter during the description of my device.

The objects of my invention are accomplished by differentiating the motion of the' carrier into a number of components, transferring these components into motions of an indepemlent imi-naher, in directions perpendicular to each other, combining these perpendici..ar motions into a single integrated iii-ation of the independent member, and tracnn Hao motion m2 i 1.a. las? mentioned memlier upon a plat'tcd chart. The trsingl of the motion oi' the member over the platted chart therefore represents the motion of the carrier over or through the medium over which it travels.

By invention consist-s substantially in the construction. combination and arrangement of parts associated therewith or as will be more fully hereinafter set forth as shown by the accompanying drawings and finally pointed out in the appended claims.

Reference is to be had to the accompanying drawings forming a part of this specification in which like reference characters indi- Figure 5 is a modification of my improved type of record board,

Figure 6 is a detailed construction of the yoke mountings, bearings and adjustable members for the mounting of the friction wheels used the various in,odiifirjzations Figure 7 is a detail view of the recording stylus and carriage used in conjunction with the improved plotting board,

Figure 7 a is a detail end view of the stylus tracer showing the apparatus for raising the stylus from the tracing chart,

Figure 7b is a detail View of themecha- .nism for releasing the stylus tracer and car riage from engagement with the worm screw 72 for movement of the stylus tracer to a point upon the chart indicative of the origi` nal position of the carrier before the piacing of the device in operation,

Figure 8 is a perspective view of a modification of my device wherein the number' of operating parts of the device shown in Figure 1 are substantially reduced.

Figure 9 is a perspective view of the primary parts of Fig. 8 with their supporting framework removed for clearness.

Figure 9a is a detail view of the manner of mounting friction dise #17 within the frame 109 and of the transmitter used to control the follow-up motors shown in Figures 18 and 19, i

Figure 10 is a disassembled isometric view of the parts shown in the portion designated as ABCDFFGH of Figure S.

Figure 11 a front view of the device shown in Figure 10, with the scale emoved.

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.l., Figure 13 is an isometric View of the modification of the device used in the place of the element shown in Figure 10, that operates in conjunction with scales shown in Figures 25-28, to introduce the corrections designated in the various legends of those iigures, .'J

Figure 14 isa cross-section on linel 14-14 of Figure 13,

Figure 15 is an end view of the device Vshown in Figure 14 in the direction of the arrow (K),

Figure 16 is an end view of the device shown in Figure 14 in the direction of the arrow (L),

Figure 17 is an isometric view of a modicatio-n of my improved record board with :50 associated parts,

Figure 18 is a detail view of the portion of Figure 17 designated as QRSTUVW,

Figure 19 is an end view of the device shown in Figure 18 in the direction of thei'es arrow (M),

Figure 2O is a detail view in broken parts 4of the arm 86 of Figure 17,

Figure 21 is an end view of the arm shown in Figure 20 in the direction of the arrow (N),

Figure Q2 is an end view of the arm shown in Figure 2O in the direction of the arrow 's a end view of the arm shown s in the direction of the arrow Figure 24 is a sectional view on the line (Y-Y) of the arm shown in Figure 2O in the direction of the arrow (Q):

Figures 25 to Q8 represent the scales to be used in conjunction with the device shown in Figure 13.

Referring particularly to Figure 1. numeral 1 represents a shaft that is driven by any well known means, as, for example, a log mo tor Q, at a speed of rotation proportional to the speed of the moving carrier. The rotary motion of shaft 1 is transmitted to flat driving discs 3 and d through gear to gears 6 and 7 on the end of splined shafts S and 9. mounted in bearing-plates 10 and 11 upon the opposite sides of base 12. Upon the hase 12 are two carriage ways 13 and 14 formed by brace members 15. 16 and 17. TNithin these carriage ways are placed two carriages 18 lll) `and 19' upon which the driving discs 3 and 4 are` mounted. These carriages also support bearing plates 2O and 21 upon which gears 22 andQB are respectively mounted and held .in position upon splined shafts 8 and f) respectively'. 'T he rotation of .gears and Q3 is in parted to the fiat discs il and 4 throufrh ruiter gears 2l and and endless chains 2C S upon *fihi 'h which gears ar pivots 31 aud 32. by worm gears 33 and 31 mount lilounted beu `s are rotated d upon shafty i 35 that isdriven at a speed corresponding to 'the rate of change in direction ot the motion of the carrier over the plane surface upon .which it travels. Shaft 35 is driven by any Well known means such as a follow-up motor,

36, electrically connected tothe directive indiadapted to fit respectively in slots 3S and 4D formed on the underside of carriages 19 and 18 respectively. It ivill be seen that as the shaft 35 rotates gears l29 and 30, the slidingr carriages 19 and 18 will move in a reciprocatn mg motion proportional to the cosine of the angular displacement of the rcvolvable gears "29 andBO. s

Within suitable guides 41 and 42 in brace members y17 and 16 1s positioned a carriage member 43 capable of movement in a vertical vdirection but xed with respect to an;-r horzontal movement by the sides of the guides 41 and 42 and b v pins 44 and 45 at the base of-the guides. Additional Jfunctions yot' the pins 44 and 45 are described With reference to Figure 3. The weight ot carriage member 43 has been found suicient to maintain discs 46 and 4T in frictional engagement with the surface of rotating discs 4: and 3. However. should it be found that there is any slip between the friction discs 4T and 46 and the rotating discs 3 and 4. a slight additional pressure ma)vv be exerted between the tvv-o by placing a tension upon spring.r 48 and a coi'- responding spring' at. the opposite end of carriage member aiiixed thereto and attached to lug 49 upon the base 12.

The rotary motion imparted to friction discs 46 and 47 is imparted to Worin shaft and splined shaft 51 of Figure 2 bv means of reduction gearing 5:2 and 53. shafts 55 and 56. gears 5T and 5S. endless chains 59 andtiO. and gears 61 and 62, or bv suitable electrical connection such as a transmitter and follow- 'up motor.

Referringr novv to Figure 2. G3 Vrepresents -the record board upon the corners ot which ai... ...0L '.iiiu ein: 1.1M. litlution between the carri n ber operated bv 'Lhe ivoriii shaft. Blocks 69 and T0 are rigidi)v fixed together by means ot hollow member T1. Nithin the hollow men'ibcr T1 is located a worin screw ''upon the end of which is a miter gear 73 in engagement with initer gear TLl operating upon splined shaft 51. e

ANoiinted upon the surface ot' hollow ineinbcr f1-is a stylus carriage 7:3 shown and described in-detail with reference to Figure 7 Mounted between the blocks 69 and. TO is spline shaft T6 operated b v an electromagnetic arm 199e secured thereto and operated by electromagnet 77 to raise the stylus and thereby interrupt the tracing movement of the stylus. The detail mechanism whereby this eii'ect is obtained, is described with reference to Figures 7, 'Ta and 7b.

Referring particularly to Figure 3, a detail vienT ot a portion of the mechanism ci 'Figure 1, 43 represents the carriage member shown in full in Figure 1. 45 represents a. pin extending into groove guide L11 and 3 represents the fiat driving disc. Upon the luider side ofthe carriage 1S) is placed a lujo,r T8 that engages with alever T9 pivoted at a point SG. The opposite end of lever TS) engages the lower end of -pin e5. ln this inanner, when carriage 19 is moved to a dead center position. lug 78 engages the lever T) v'lierebv friction discs 46 and #1T are raised out of engagement with the driving discs 3 and 4.

A similar deviceis used with reference to drivingr disc et, to prevent the Wear upon thc friction discs when disc e is at its dead center position.

Figure #l represents a -device that may bc substituted tor the elements shown in Figure 1 that are mounted upon the member 2S. This device consists of a helical screw of va jfing pitch such that lue' Sl. attached to carriage 19 upon which disc 3 is mounted. is given a motion identical with that described wth reference to Figure 1. This helical screw mounted in end thrust ball bearing races 82 a .d connected to follow-up motor 36.

Referring particularly to Figure 5, which represents a detail view of one torni of inv' improved plotting board. G3 represents the base upon one end ot which is n'iountedbearing'plates 83 through which is mounted vform screw 6?' vvhich is driven bv follow-up motor 8st at a speed corresponding to the speed ot rotation of gear 52 of Figure 1. Between the beariner plates is mounted a guide shaft upon .which is mounted an aini S6 ot' the type shown, which arm carrier members Si engageable with Worin screvv 6T. Lengthivi'e otl thearni mounted a worin screw 72 driven at a speed correspoiuling to the rotation ot fear 53 of Figure 1 bf.' follow-ily) motor The ari 8f3 carries a stylus carriage vT5 in en( igement with the worm sciev: T2 and similar to that to be described with rc' "'icc to Figure T and as inentioi'ied 'with referer. F igure 1.

Referring to Figure 6, l? represents the screws 92.

friction'discs of Figures 1, 3- and i1 mounted upon axle 89 which in turn is mounted in ball bearing races 90. rlhese races are held in position in supports 91. Endwise adjustment of the axle 89 is made possible by means of Upon the laxle 89 is gear Wheel 93 forming a part of the reduction gearing of Figure 1. f

In Figures 74772, 76 and 71 respectively represent the Worml shaft, splined shaft and hollow member described with reference to Figures 1 and 5. Around the hollow member 71 is positioned a carriage device 91 vvith indices 95 and 96 which travel over scales 97 and 98. The carriage device engages the Worm shaft 72 in t'ie manner shown in dotted lines. By means of arm 99 attached to the carriage device 94, there is supported a dial 100 calibrated in degrees, through the center of which is mounted a shaft 101. `Upon the lower end of the shaft 101 is supported a balanced arm 102 carrying a Wheel 103 that remains in contact with the surface of the record chart. Upon the upper end of the shaft 101 and rigidly aflixed thereto is an index arm 104: in slidable contact with the calibrated dial 100. It will be seen that as thestylus carriage nieves over the surface of the record chart the action of vvheel 103 upon the chart keeps the index arm 101 at a point upon the calibrated dial indicative of the direction of the mot-ion of the carriage 4 over the surface.

Referring particularly to Figure 7a. 7 6 represents the splined vshaft upon which'is mounted a lever 199 that engages the member 200 which is movable in a vertical direction Within the carriage member 9%. Member 200 carries the tracing element 201 that` is held in a fixed position by any setting device designated as 202.

In Figure 7b numeral 203 represents a thumb knob upon the end of an eccentric shaft- 20:1 that is mounted Within the female member 205, that engages the Worm shaft 7 2. When it is desired to move the stylus carriage 94: along the hollow member 71 thumb knob 203 is rotated to a position such as that shown in the dotted lines of Figure 7. This allows the free movement of the sttvlus member along the east-west directions of the record chart.

Referring particularly to the i'nodiitication shown 1n Figures 8 and 9, 11a represents a frame 1n which carriage Ways 13 and 11 are mounted. lVitlnn the carriage Ways 1S and 11 are positioned the reciprocating carriageI discs mounted in frames 108 and 109 vhich are pivoted to frame by members 110 and 111. Arms 112 and 113 pivoted to the upper ends of frames 108 and 109 engage rocker arms 114 and 115 which are mounted in bearings 116 and 117 rigidly aiixed to the 'frame 105. Upon the inner ends of rocker arms 1141 and are mounted adjustable elements 118 and 119 whichl consists of set.

screws and lock nuts that engage lugs 78 upon carriage 18 and 19 when either of the carriages are in dead center position.

f The essential difference between this device and that described with reference to Figures 1 and 2 is the substitution of one disc gear 120 upon Which there are tivo arms 121 and 122 mounted at right angles to each other, and driven by the shaft 35 through gearing 129, in the place of the two discs 29 and 30 and their associated parts as described in Figure 1.

The rotary motion imparted to friction discs 46 and -17 is transmitted to the elements of the record board in a manner similar to that describe-d with reference to Figure 1.

Referring particularly to Figure 9a., 109

lrepresents the frame Within which friction `motor described in Figures 8 and 9. In engagement with gears 6 and 7 is a main gear 121 that is mounted upon a shaft 125 through support member 126 which is affixed to the frame 105. Upon tiis shaft a bearing plate 1 27 is mounted adjacent the opposite side of the support member 126. Against the sur face of plate 127 bears a friction Wheel 128, which is mounted in a yoke 129 aud this in turn is adjustable by means of calibrated thumb screw 133. Upon this yoke is located a pointer 130, shown in operative relation to scale 131, detail iigures of Which are designated as Figures to 28. Through friction Wheel 128 is a spline shaft 132 connected to follow-up motor controlled bv the speed log motor. v

It will thus be seen that variation in the setting of the friction disc 128 along a radius of bearing plate 127 will introduce a variation in the rotation of 6 and 7 and this in turn itroduces a correction in the tracing of the stylus 75 over the chart. vUpon thewend of shaft is a rcvolutior counter 't3-'t connected thereto bjr means oi' suitable gearing 135.

Referring to Figures 13 .to 16, vthich represent a modification of the device to be substiface of which friction wheel 128 mountedtuted for the mechanism shown and described with reference to Figures to 12, 12T represents the i'lat driving plate against the surupon spline shaft 132, is held in position by voke 125i. The position of yoke 129 is ad# tains a slot- 137 into which is inserted a lug 138. Lug 13S is mounted upon Worm screw 139 that is lined in the bearingr in housing' member 140, which is rotatable in bearings 141 that is mounted in frame 105. Bearing 1411 is adjustable laterally by means of calibrated thumb nut 142 that rotates worin shaft 113 which is threaded in bearing 141; The relative position of bearing 141 is indicated by index 1l5 movable upon Worm shaft 1-l6 of the same pitch as Worm shaft 14?. Upon the outer surface of the frame 105 and rigidlv afixed to housing member 140 and rotatable therewith in bearing 141 is a calibrated vdial 144.

Mounted Within the housing member 140 is shaft- 1-17 that is adjustable to three distinct positions. Upon the inner end of shaft 14T is a miter gear 148 that engages miter ,gear 149 Y that is mounted upon Worm screw 139 the motion of which adjusts lug 138 longitudinally of Worm screw V139. This motion isl accomplished by means of thumb nut 150 that/is upon the outer end or" shaft 1i? when the 14T and its associated parts is in its eXtreme inner position.

Upon shaft 14T is positioned a land mem' ber 151 with lands every five degrees apart.

Tilhen the shaft 14T is in its extreme inner position land membez` 151 rotates freely within a pocket in housing member 140. lfhen shaft- 147 is moved into its intermediate posiion by the action of springl 152, exerting an out-Ward pressure upon thumb-nut 150, land' member 151 engaees with the tluted portion 153 of calibrate-d uial member j It will be noted that when the lug 13S has `been set at any desired position by means of the rotation of thumb nut 150, which adjustment determined the amount ot throw exerted upon yoke 129, and when shaft 14 is moved to its intermediate position, any rotation of thumb nut 150 causes an adjustment of the friction disc 128 along the radius of bearingT plate 12T. Adjustment of lug 138 along' the Worm screw 149 therefore introduces a correction tothe tracl: for the amount of current in the medium through which th carrier is travelling. Likewise the adjustment of housing; member 11G about its axis of rotation introduces a correction into the track.

for the angular direction of the current relative to the course of the carrier through the medium. Y

Een .shaft- 14'?, with its corresponding parts. is in its extreme outer position land member 151 engages the tluted portion 153 of calibrated dial 111 and the lutel portion throi gh friction clutch 162 against Whichbears spring 163 that is under compression. The other end or" spring 163 bears against member 164 that carries a plurality of pins -which engage in pockets in gear 166, that is upon the shaft 161 of motor 36. By the use of such'a mechanism any angular adjustment between the shaft- 161 of follow-up motor 36 and the shaft may be made with facility, to correct the plotting of the chart for any temporary errors in the direction determininoi apparatus of the carrier.

Referring particularly to Figure 1T, 63 represents the record board, 86 the tracer arm, 67 the north-south Worin rod, 51 the spline shaft transmitting the east-West componentto the stylus tracer 'T5 of Figures 1 and 5. 16T indicates a unit attached to the Worm .rod 6T and the spline shaft 51, details of which shown and described in reference to Figures 18 and 19.

Referring particularly to Figures 18 and 19, numeral 168 designates a follow-up motor driven at a speed correspon-ding to the speed of rotation of friction disc el? of Figures 1 and 9. The rotation of motor 168 is imparted to shaft 1G19 through a variable transmission 170, that, in this particular case, consists of two speeds namely a 1-1 and a 1--2 ratio. It `vill be understood that the ratios of this transmission may be changed to accommodate the apparatus to the use to which it is to be placed and to compensate for trans mission ratios throughoutl the entire apparatus that may vary from those I have used in the construction of the devices described, Without departing from the spirit of my invention.

Rotation of shaft 169 is transmitted through gearing 111 to spline shaft 172 upon which is mounted a friction Wheel 178 that is adjustable along the radius of a friction disc 17st. Friction Wheel 1TB is adjustable aloner the radius of friction disc 17a by means oi: volre 175 which is mounted upon Worin shaft 1.76 that is rotated by means of knob 1 7? through miter @caring 17S. T he rotation of fric ion disc lis is transmitted to shaft 51 by means of ivorm gearingr 179. By this description it will be seen that any variation in the speed of rotation of friction disc i? of Fifiures 1 and 9 is resolved into a. variation in the speed of movement of the stylus of Figures 5 and 1T in the east-West direction.

An identical apparatus is enclosed within the casing 15T for the movement of the stylus 7 5 in a north-south direction. This movement is induced by variations in the movement of the friction disc 4G of Figures 1, 2, 10, 11 and 12. Shafts 51 and 6T are broken to allow the ready removal of the unit 16T from plotting board 63.

Referring particularly to Figures 2O to 9A, 86 represents the arm carrying Worm rod 72 which is driven by spline shaft 51 through miter gearing 'T2-5 and T4. Gne end of the tracer arm 86 is carried in straight-edge carriageway' 180 in one side of the plotting board G3. The outer end of the tracer arm 86 is carried upon ltrack 181 upon the side of the record board 63 opposite the carriage- Way 180. Stylus tracer is mounted upon the straight-edge portion 182 of the arn 86. The tracer arm is pivoted at points 183 so that it may be raised avfay from th surface of the record board to apposition similar to that shown in Figure 5. .Adjustment of the stylus tracer 75 in an east-West direction may then be made by means of cranl; element 184 by engaging the same with gear 185 upon the outer end of the worm shaft T2. l,Vorm shaft 72 is broken by a friction clutch, as shown at point- 188 in Figure 23, at the point of pivot of the arm SQ with the carriage 185, to allow the arm to be raise l.

When it is desired to move the tracer arm and the carriage in a4 north-south direction, lever 186 (see Figure 22) is raised thus disengaging the Worm screw member 187 from the Worm shaft Then, by engaging crank element 184: with gear 189 upon the end of a shaft 190, any rotation of the crank element 18-1L produces a movement of the arm and carriage in a north-south direction by means of pinion gears 191 and 192 engaging respectively raclts 181 and 193 upon the record board. f

It is to be noted that in Figure 24 there is shown a further means yfor releasing the stylus carriage 75 to allowl it to be moved in a north-south direction. This means consists of an eccentric shaft operated by thumb nut 195, which is held in the in or out position by snap catch 196. In the inward position, member 19T is firmly held in engagement with the Worm screw ,72 ivhile in theoutivard position of eccentric shaft 19s member 197 is held free of the Worm shaft 72. It is possible to move the stylus carriage freely up and down the carriage arm 86.

Upon the lovrer de of the stylus member .the chart.

is introduced' into the track of the carrier upon the'chart for the errors introduced therein by these known factors.

The curves shown in Figures 26-28 are produced in the manner described With reference to Figure 25 and are used to correct for errors introduced into the track by the 'elements described in the legends included in each figure.

Having thus described the elements of my invention and their relation to each other a summary of the effects produced by the operation of the various elements is as follows. The motion'of a carrier in a given direct-ion is resolved into tivo resultant motions corresponding to the cosine of the angular relation of the direction of movement of the carrier to the two cardinal directions. These i'notions are then combined by means of the mechanism described upon the plotting board and traced upon a chart.

Varying factors Were found that introduced errors into the resultant tra -ng upc-n Thesefactors were slippage of the driving mechanism of the carrier at various speeds thereof.y motion of the medium through which the carrier was moving and known errors in the directive indicating instrmnents upon the carrier.

The error introduced by the `slippage in the driving mechanism of the carrier is compensated for through the mechanism operated and described with reference to the thumblsnob 142 of Figure 15, decreasing or increasing the movement of the motion of the stylus in the two cardinal directions simultaneously thus increasing or decreasingV the value dependent upon the cosine of the angle of travel of the carrier relative to the two cardinal directions. f

The error introduced into the chart by the motion of the medium through. which the carrier was moving is compensated for by the mechanism operated by thumb knob 150 that. through the mechanism described increases or decreases the movement ofthe st vlus tracer in the two cardinal directions.

In this manner the length of tracing is increased to compensate for the additive or subtraetive motion of the carrier due to the movement of the medium through which the carrier is travelling.

Those errors introduced into the record upon the chart b v the errors in the directive indicating instrumen-ts of the carrier are compensated for bv increasing the value of the cosine of the angle of the direction of travel of the carrier to one caroinal direction and by decreasing the value of the cosiiieof the angle of the direction of travel of the carrier to the other cardinal direction so that the resulting chart is a correct record of the true directionpof travel ofthe carrier. These corrections are introduced by means ofthe mechanism described as operated bv knob 164.

The making by power of all of the aforesaid movements Simultaneously wita the relative motion of the body and a plane surface. and the provision for manual adj ustnients ot the several elements intermediate the power driving means and the resultant record in order to compensate .for the variable concitions which human experience can best appreciate and provide, insure accuracy of the resulting record upon whose correctness safety, life and property are dependent,

My method of obtaining such accuracy of record may be achieved by any of many forms of apparatus.

It will be understood that the above description and accompanying drawings coni- 253 prehend onlv the general and preferred einof the relative motion of a bod bodiment of my invention and that minor detail changes in the construction and arrangement of parts may be made within the scope of the appended claims and withou. sacricing any of the advantages of my inention The invention herein described ma;v be manufactured and used b v or for the Government of the United States for govern- I mental purposes without the payment to me of any royalty thereon or therefor. l

Having thus described my invention, what I claim is as follows:

1. In the operation of recording the course of the relative motion of a body and a plane surface, the method consisting of simultaneously with said motion. making two movements each of whose magnitudes is proportional to said motion; then, simultaneously with said motion, transforming said first movements into two linear right angled movements, the rate of one of which being proportional to the sine, and the other to thev cosine, of the angle between the direction of said motion and a reference direction; and simultaneously transforming said two right angled movements into a resultant single movement upon a record.

2. In the operation of recording the course y and a plane surface. the method consistingT of, simultaneousljv` with said motion. making a movement whose magnitude proilortional to said motion; then, .simultaneously with said motion, transforming said i'irst inmenie-*it into two linear right `angled movements. th

rate of one ot which being ^rfi1,ff;ti;\nal to the sine, and the other to the cosi of the augle between the direction of said motion and a "l reference direction; then varying the rate oi ment whose magnitude is proportional tov said motion; then, simultaneously with said motion, transforming said rst movement into two linear right angled movements, the rate of one of which being proportional to the sine, and the other to the cosine, of the angle between the direction of said motion and a reference direction; then varying the rate of movement to be imparted from said cosine movement to compensate for driftl and other variable directional conditions; and simultaneous with said motion transforming said two linear movements, at said one varied rate, into a resultant single movement upon a record.

4. In the operation of recording the course of the relative motion of a body and a plane surface, the method consisting of, simultaneously with said motion, making a movement whose magnitude is proper to said mot-ion; then, simultaneously with said motion, transforming said firstmovernent intotwo linear right angled movements, the rate of one of which being proportional to the sine, and the other to the cosine` of the angle between the direction of said movementand a reference direction; then, varying the rate of movement to be imparted from saidY sine movement to compensate for currents and other variable traverse conditions, and varying the rate of movement to be imparted from said cosine movement to conipensate for drift and other variable directional conditions; and simultaneously with said motion transforming said two right angled movements, at said varied rates, into a resultant single movement upon a record.

5; In the operation of recording the course ot the relat've motion of a bodj,1 and a plane surface. the method consisting of, simultaneously with said motion. making two movements each of whose magnitude proportional to the velocit;1 of said motion; then, simultai'ieouslf.' with said motion. transforming said tirst movements into two linear right ment to compensate for currents and other' variable traverse conditions: and, simultaneously with said motion, transforming said.

e being tvro right angled movements, at said one varied rate, into a resultant single movement upon a record.

6. In the operation of recording the course oi the relative motion of a body and a plane surface, the method consisting of, simultanewith said motion, making two movecacli of Whose magnitude being proportional to the velocity oi said motion; then, .:imultaneously with said motion, transforming said rst movementinto tvvo linear right an d movements, the rate of one of which being proportional to the sine, and the other` to the cosine, of the angle between the direction of said relative motion and a reference direction; then varying the rate of movement to be imparted from said cosine movement to compensate for drift and other vari/able directional conditions; and, simultaneously `with said motion, transforming said two right angled movements, at said one varied rate, into a. resultant single movement upon a record.

'T'. In the operation ot recording the course of the relative motion ot a body and a plane surface, the method consisting of, simultaneously with said motion, making tvvo movements cach of Whose magnitude is proportional to the velocity of said motion; then, simultaneous with said motion, transforming firs ements into tvvo linear right angled movements, the rate of one of which proportional to the sine, yand the other to the cosine, of the angle between the direction of said relative motion and a reference direction; t ien varying the rate of movement to be imparted from said sine movement to compensate for currents and other variable traverse conditions, and varying the rate ott movement to be imparted from said cosine movement to coi'npensate for dritt and other variable directional conditions; and. simultaneous '-.vith said movement, transforming said tivo righi:l angled movements, at said varied rates, into a resultant single movenient upon a record. i

S. In the operation of recording the course ot the relative motion of a body and a plane surface, the method consisting of the step of making a plurality7 of definite movements proportional to the velocity and direction of said motion. the step of resolving said movements into a resultant single movement upon a record and intermeoiate said steps varying the rate of movement to be transmitted from one of said intermediate movements to compensate for variable traverse conditions.

9. n the operation of recording the course of thc relative motion of a body and a plano surface. the metlfl consisting of the step of mal-:ing a pluralityY of definite movements proportion l to the velocity and direction of said motion, the step ot' resolving said movements into a resultant single movement upon a record, and intermediate said steps varyo Wit ing the rate of movement to be transmitted from one of said intermediate movements to compensate for 'variable directional conditions.

10. In the operation of recording the course of the relative motion of a body and a plane surface, the method consisting of the step of making a plurality of definite movements proportional to the velocity and direc tion of said motion, the step of resolving said movements into a resultant single movement upon a record, and intermediate said steps varying the rate of movement to be transmitted from tivo of said intermediate movements to compensate respectively for variable traverse and directional conditions. y

11. In apparatus for recording the course of the relative motion of a body anda plane surface; means for making. simultaneously With said motion, tivo movements each of Whose magnitude is proportional to the relative velocity of said motion; means for transforming, simultaneously with said motion, said irst movements into two linear right angled movements, the rate of one of which being proportional to the sine, and the other to the cosine. of the angle between the direction of said relative motion and a reference direction; and means for simultaneously transforming said two right angled move.- ments into a resultant single movement upon a record. y

l2. In the apparatus for recording the course of the relative motion of a body and a plane surface; means for making, simultaneously with said motion, a movement- Whose magnitude is proportional to the relative velocity of said motion; means for transforming, simultaneously With said motion, said first movement into tivo linear right angled movements, the rate of one ot Which being proportional to the sine, and the other to the cosine. of the angle between the direction of said relative motion and a reference direction; means for varying the rate of movement to be imparted from said sine movement to compensate for variable traverse conditions; and means for transforming, simultaneously with said motion, said tivo right angled movements, at said varied rate for one of said last stated movements, into a resultant single movement upon a record.

13. n apparatus for recording the course of the relative motion ot a body and a plane surface; means for making. simultaneously h said motion, a movement Whose magnitude is proportional to the relative velocity or" said motion; means for transforming. taneously `with said l`lotion, said first movement into tivo linear right angled movements, the rate of one of which being proportional to the sine, and the other `to the cosine, of the angle between the direction of said relative motion and a reference direction; means for varying the rate of movement to be imparted from said cosine movement to compensate for variable directional conditions; and means for transforming said two linear movements, at said one varied rate, into a resultant single movement upon a record. p

14. In apparatus for recording the course of the relative motion of a body and a planeV surface; means for making, simultaneously with said motion, a movement whose magnitude is proportional to the relative 'velocity of said motion; means for transforming, simultaneously with said motion, said first movement into two linear right angled movements, the. rate of one of which being proportional to the sine, and the other to the cosine, of the angle between the direction of said relative motion and a reference direction; means for varying the rate of movement to be imparted from said sine movement to compensate for variable traverse conditions; means for varying the rate of movement to be imparted from said cosine movement to compensate for variable directional conditions; and means for transforming said two right angled movements, at said varied rates, into a resultant single movement upon a record.

15. In apparatus for recording the course of the relative mgtion of a body'and a plane surface; means for maaing simuitaneousiy with said motion, two movements each of whose magnitude is proportional to the velocity of said motion; means for transforming, simultaneously with said motion, said first movements into two linear right angled movements, the rate of one of which being proportional to the sine, and the other to the cosine, of the angle between the direction of said relative motion and a reference direction; means for varying the rate of movement to be imparted from said sine movement to compensate for variable traverse conditions; and means for transforming, simultaneously with said motion, said two right angled movements, at said one varied rate, into a resultant single movement upon a record.

16. In apparatus for recording the course of the relative motion of a body and a plane surface; means for making, simultaneously with. said motion, two movements each of whose magnitude being proportional to the velocity of said motion; means for transforming, simultaneously with said motion, said rst movements into two linear right angled movements, the rate of one of which being proportional to the sine, and the other to the cosine, of the angle between the direction of said relative motion and a reference direction; means for varying the rate of movement to be imparted from said cosine movement to compensate for variable directional conditions; and means for transforming, simultaneously with said motion, said two right angled movements, one at said varied rate, into a resultant single movement upon a record.

17. An apparatus for recording the course of the relative motion of a body and a plane surface; means for making simultaneously with said motion, two movements each of whose vmagnitude is proportional to the veiocity of said motion; means for transforming, simultaneously with said motion, said first movements into two linear right angled movements, the rate of one of which being proportional to the sine, and the other to the cosine, of the angle between the direction of said relative motion and a reference direction; means for varying the rate of movement to be imparted from said sine movement to compensate for variable traverse conditions; means for varying the rate of movement to be imparted from said cosine movement to compensate for variable directional conditions; and means for transforming said two right angled movements, at said varied rates, into a resultant single movement upon a record.

18. In apparatus for recording the course of the relative motion of a body and a plane surface, means for making two definite movements proportional to the velocity' and direction of said motion; means for resolving said movements into a resultant single movement vupon a record; and means intermediate said first and second named means for varying therate of movement to be transmitted from said first named means to said second named means to compensate for variable traverse conditions.

19. In apparatus for recording the course of the relative motion of a body and a plane surface, means for making two definite movements proportional to the velocity and directionof said motion; means for resolving said movements into a resultant single movement upon a record; and means intermediate said first and second named means for varying t the rate of movement to be imparted from said first named means to said second named means to compensate for variable directional conditions. y

20. In apparatus for recording the course of l the relative motion of a body and al plane surface, means for mal-:ing two definite movements proportional to the velocity and direction of said motion; means for resolving said moven'ients into a resultant single movement. upon a record; means intermediate said first and second named means for varying the rate of movement to bc transmitted from one of the later movements of said first named means to said second named means to compensate for variable traverse conditions; and separate means intermediate said first and second named means for varying the rate of movement to be transmitted from another of the later movements of said first named means to.

VLegnaia said second named means to compensate for variable directional conditions.

2l. In apparatus for recording the course of the relative motion of a body and a plane surface, a log motor, a directional motor, record means, means driven by said two motors for producing on said record means said course of said body; and manually operated means intermediate said log motor and said 10 second named means for adjusting the rate of movement of said second named means to compensate for variable traverse conditions.

22. In apparatus for recording the course of the relative motion of a body and a plane surface, a log motor, a directional motor, record means, means driven by said two motors for producing on said record means said course of said body; and manually operated means intermediate said directional motor and said second named means for adjisting the rate of movement of said second named means to compensate for variable" directional conditions.

23. In apparatus for recording the course of the relative motion of a body and a plane surface, a log motor, a directional motor, record means, means driven by said two motors for producing on said record means said course of said body; and a plurality of manually operated means intermediate said motors and record means for adjusting the rates of movement of said second named means to compensate for variable conditions encountered.

` FRANK N. SAYRE. 

